Do
Do and does are both present tense forms of the verb ‘to do’.
We use ‘do’ with the pronouns I, we, you and they.
‘Do we have to wait for the bus?’
‘I do my homework straight after school.’
‘They do their shopping on Saturday.’
We use ‘does’ with third person singular pronouns: he, she or it.
‘Does she work late every night?’
‘He does the cleaning on the weekend.’
‘Does it always rain here?’
‘Did’ is the past tense of do and does.
‘Did she work late every night?’
‘I did my homework straight after school.’
Flickr CC: Robert Couse-Baker